FAX2TIFF (1)
create a
Class F fax file from raw fax data
SYNOPSIS
fax2tiff
[
options
] [
-o
output.tif
]
input.g3
DESCRIPTION
Fax2tiff
creates a
file containing
Group 3 or Group 4 encoded data from one or more files containing ``raw''
Group 3 encoded data (typically obtained directly from a fax modem).
By default, each row of data in the resultant
file is 2-dimensionally encoded and
padded or truncated to 1728 pixels, as needed.
The resultant image is a set of low resolution (98 lines/inch)
or medium resolution (196 lines/inch)
pages, each of which is a single strip of data.
The generated file conforms to the
Class F (\c
) specification for storing facsimile data.
This means, in particular, that each page of the data does
not
include the trailing
return to control
(\c
) code; as required
for transmission by the
Group 3 specifications.
The old, ``classic'', format is created if the
-c
option is used.
(The Class F format can also be requested with the
-f
option.)
The default name of the output image is
fax.tif ;
this can be changed with the
-o
option.
Each input file is assumed to be a separate page of facsimile data
from the same document.
The order in which input files are specified on the command
line is the order in which the resultant pages appear in the
output file.
OPTIONS
DIAGNOSTICS
The following warnings and errors come from the decoding
routines in the library.
Warning, %s: Premature EOL at scanline %d (x %d).\en .
The input data had a row that was shorter than the expected value of 1728.
The row is padded with white.
%s: Premature EOF at scanline %d (x %d).\en .
The decoder ran out of data in the middle of a scanline.
The resultant row is padded with white.
%s: Bad code word at row %d, x %d\en .
An invalid Group 3
code
was encountered while decoding the input file.
The row number and horizontal position is given.
The remainder of the input row is discarded, while
the corresponding output row is padded with white.
%s: Bad 2D code word at scanline %d.\en .
An invalid Group 4 or 2D Group 3
code
was encountered while decoding the input file.
The row number and horizontal position is given.
The remainder of the input row is discarded, while
the corresponding output row is padded with white.
BUGS
Should not have the constant width 1728 built into it.
Input data are assumed to have a a ``top left'' orientation;
it should be possible to override this assumption
from the command line.
SEE ALSO
s-1CCITT s+1 Recommendation T 4 (Standardization of Group (3) Facsimile Apparatus for Document Transmission) The Spirit of TIFF Class F an appendix to the TIFF 5 0 specification prepared by Cygnet Technologies - tiffinfo (1) -
- tiffdither (1) -
- tiffgt (1) -
libtiff(3)
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